Chess South Africa
Last updated:
Player Page
Home
Chess South Africa
Grobbelaar, M (Mari)
Dob:
2016/04/20 (U10)
Gender:
Female
Chess SA id:
2160158380
FIDE id:
Region:
Tshwane (GTP)
Citizen:
RSA
Title(s):
Last active:
2024/06/01 (17 days ago)
Ratings
The
Projected values
below are
NOT
the actual and official values as calculated by the Ratings Bureau.
Main
Standard
Rapid
Blitz
Raw rating
=Current rating,
Weighted rating (WR)
=Weighted average of current/new Raw rating + last 23 published Raw ratings),
Weighted performance (WP)
=Weighted average of last 5 tournaments
Current Raw rating
1309.9
Current Weighted rating
1291.1
Current Weighted performance
1224.5
Current official/published rating (highest between Raw, WR and WP)
1309.9
Current highest rating achieved
1359.2
Current floor (min rating allowed)
859.2
Current K-factor
36
Games played this month
5
Score (S)
2.0
Expected score (We)
3.55
Difference (S-We)
-1.29
Current Raw change (no limits, including tournament time weight)
-46.3
Current min/max change allowed (with limits)
±141.8
Current Raw change used (final)
-46.3
Projected new Raw rating
1263.6
Projected new Weighed rating
1190.4
Projected new Weighted performance
1159.2
Projected new final Raw rating (if new WP > new Raw)
1263.6
Projected new highest rating
1359.2
Projected new floor
859.2
Projected new K-facor
36
Projected new official/published rating (highest between new Raw, new WR and new WP)
1263.6
Projected effective change (new Official - current Official)
-46.3
Raw rating
=Current rating,
Weighted rating (WR)
=Weighted average of current/new Raw rating + last 23 published Raw ratings),
Weighted performance (WP)
=Weighted average of last 5 tournaments
Current Raw rating
1296.6
Current Weighted rating
1285.3
Current Weighted performance
1224.5
Current official/published rating (highest between Raw, WR and WP)
1296.6
Current highest rating achieved
1351.7
Current floor (min rating allowed)
851.7
Current K-factor
36
Games played this month
5
Score (S)
2.0
Expected score (We)
3.55
Difference (S-We)
-1.55
Current Raw change (no limits, including tournament time weight)
-55.8
Current min/max change allowed (with limits)
±144.5
Current Raw change used (final)
-55.8
Projected new Raw rating
1240.8
Projected new Weighed rating
1184.9
Projected new Weighted performance
1159.2
Projected new final Raw rating (if new WP > new Raw)
1240.8
Projected new highest rating
1351.7
Projected new floor
851.7
Projected new K-facor
36
Projected new official/published rating (highest between new Raw, new WR and new WP)
1240.8
Projected effective change (new Official - current Official)
-55.8
Raw rating
=Current rating,
Weighted rating (WR)
=Weighted average of current/new Raw rating + last 23 published Raw ratings),
Weighted performance (WP)
=Weighted average of last 5 tournaments
Current Raw rating
1255.4
Current Weighted rating
1236.0
Current Weighted performance
Current official/published rating (highest between Raw, WR and WP)
1255.4
Current highest rating achieved
1255.4
Current floor (min rating allowed)
755.4
Current K-factor
36
s
Games played this month
0
Score (S)
0.0
Expected score (We)
0.00
Difference (S-We)
0.00
Current Raw change (no limits, including tournament time weight)
0.0
Current min/max change allowed (with limits)
±153.2
Current Raw change used (final)
0.0
Projected new Raw rating
1255.4
Projected new Weighed rating
1138.2
Projected new Weighted performance
434.5
Projected new final Raw rating (if new WP > new Raw)
1255.4
Projected new highest rating
1255.4
Projected new floor
755.4
Projected new K-facor
36
Projected new official/published rating (highest between new Raw, new WR and new WP)
1255.4
Projected effective change (new Official - current Official)
=0.0
Raw rating
=Current rating,
Weighted rating (WR)
=Weighted average of current/new Raw rating + last 23 published Raw ratings),
Weighted performance (WP)
=Weighted average of last 5 tournaments
Current Raw rating
1200.0
Current Weighted rating
1200.0
Current Weighted performance
Current official/published rating (highest between Raw, WR and WP)
1200.0
Current highest rating achieved
1200.0
Current floor (min rating allowed)
700.0
Current K-factor
36
Games played this month
0
Score (S)
0.0
Expected score (We)
0.00
Difference (S-We)
0.00
Current Raw change (no limits, including tournament time weight)
0.0
Current min/max change allowed (with limits)
±165.8
Current Raw change used (final)
0.0
Projected new Raw rating
1200.0
Projected new Weighed rating
1104.0
Projected new Weighted performance
Projected new final Raw rating (if new WP > new Raw)
Projected new highest rating
1200.0
Projected new floor
700.0
Projected new K-facor
36
Projected new official/published rating (highest between new Raw, new WR and new WP)
1200.0
Projected effective change (new Official - current Official)
=0.0
Tournaments
History
Tournament:
2024 Johannes Mabusela's 40th Birthday Chess Tournament F Section (D)
Start:
2024/06/01
End:
2024/06/01
Host:
GTP
Type:
Standard
Time:
60
Time weight:
0.83
Rounds:
5
Games:
5
Score:
2.0
Main rating:
1309.9
Rating gain/loss:
-46.3
Type rating:
1296.6
Rating gain/loss:
-55.8
Analysis
#
Tournament
Start
End
Host
Type
Time
Weight
Rns
Gms
Scr
Main
Type
Analysis
7
2024 Johannes Mabusela's 40th Birthday Chess Tournament F Section (D)
2024/06/01
2024/06/01
Tshwane (GTP)
Standard
60
0.83
5
5
2.0
1309.9
1296.6
Analysis
6
2024 Tshwane South School District CLOSED Individual Championships (U11 Girls)
2024/05/11
2024/05/11
Tshwane (GTP)
Standard
60
0.83
5
5
2.0
1334.2
1325.4
Analysis
5
South African Junior Closed Chess Championship 2024 (U8 Girls)
2024/04/27
2024/05/01
Ekurhuleni (GE)
Standard
120
1.00
9
9
6.0
1334.2
1325.4
Analysis
4
2024 Lubowski Open Chess Tournament (D2)
2024/03/23
2024/03/24
Tshwane (GTP)
Standard
90
0.94
5
5
3.0
1353.8
1344.5
Analysis
3
2024 Constantiapark Open (E)
2024/02/17
2024/02/17
Tshwane (GTP)
Standard
60
0.83
5
5
3.0
1359.2
1351.7
Analysis
2
2024 Tshwane Chess OPEN Registration Tournament (E)
2024/01/27
2024/01/27
Tshwane (GTP)
Standard
60
0.83
5
5
3.5
1353.2
1344.4
Analysis
1
2024 Gauteng Inter-Region Chess Championship (U8+U10 Girls)
2024/01/13
2024/01/14
Tshwane (GTP)
Standard
90
0.94
5
4
3.0
1353.2
1344.4
Analysis
#
Tournament
Start
End
Host
Type
Time
Weight
Rounds
Games
Score
Main
Type
Analysis
14
2024 Johannes Mabusela's 40th Birthday Chess Tournament F Section (D)
2024/06/01
2024/06/01
Tshwane (GTP)
Standard
60
0.83
5
5
2.0
1309.9
1296.6
Analysis
13
2024 Tshwane South School District CLOSED Individual Championships (U11 Girls)
2024/05/11
2024/05/11
Tshwane (GTP)
Standard
60
0.83
5
5
2.0
1334.2
1325.4
Analysis
12
South African Junior Closed Chess Championship 2024 (U8 Girls)
2024/04/27
2024/05/01
Ekurhuleni (GE)
Standard
120
1.00
9
9
6.0
1334.2
1325.4
Analysis
11
2024 Lubowski Open Chess Tournament (D2)
2024/03/23
2024/03/24
Tshwane (GTP)
Standard
90
0.94
5
5
3.0
1353.8
1344.5
Analysis
10
2024 Constantiapark Open (E)
2024/02/17
2024/02/17
Tshwane (GTP)
Standard
60
0.83
5
5
3.0
1359.2
1351.7
Analysis
9
2024 Tshwane Chess OPEN Registration Tournament (E)
2024/01/27
2024/01/27
Tshwane (GTP)
Standard
60
0.83
5
5
3.5
1353.2
1344.4
Analysis
8
2024 Gauteng Inter-Region Chess Championship (U8+U10 Girls)
2024/01/13
2024/01/14
Tshwane (GTP)
Standard
90
0.94
5
4
3.0
1353.2
1344.4
Analysis
7
Lardies Open Tournament 2023 (F)
2023/10/28
2023/10/28
Tshwane (GTP)
Standard
60
0.83
5
5
3.0
1251.6
1231.7
Analysis
6
2023 Gauteng Noord (F)
2023/10/14
2023/10/14
Tshwane (GTP)
Standard
90
0.94
6
6
6.0
1251.6
1231.7
Analysis
5
2023 Centurion Chess Open (E)
2023/09/23
2023/09/23
Tshwane (GTP)
Standard
60
0.83
5
5
2.0
1234.8
1246.8
Analysis
4
2023 U8 Open Chess Tournament
2023/09/02
2023/09/02
Tshwane (GTP)
Rapid
30
0.60
5
5
4.0
1234.8
1200.0
Analysis
3
2023 Etienne Lewis Closed Tournament (U8)
2023/08/26
2023/08/26
Tshwane (GTP)
Standard
90
0.94
6
5
2.0
1219.1
1224.1
Analysis
2
2023 Woman's Day Open Chess Tournament (Pawn)
2023/08/09
2023/08/09
Tshwane (GTP)
Standard
60
0.83
5
5
3.0
1219.1
1224.1
Analysis
1
2023 Menlo Open Tournament (F)
2023/07/22
2023/07/22
Tshwane (GTP)
Standard
60
0.83
5
5
3.0
1200.0
1200.0
Analysis
Game History
History
Colour
Games
Wins
Draws
Losses
Score
%
Dp
Aor
Perform
Main
All
38
21
3
14
22.5
59.2
78.3
1196.7
1275.0
White
21
11
2
8
12.0
57.1
60.7
1192.5
1253.2
Black
17
10
1
6
10.5
61.8
100.0
1201.8
1301.8
Standard
All
38
21
3
14
22.5
59.2
78.3
1196.7
1275.0
White
21
11
2
8
12.0
57.1
60.7
1192.5
1253.2
Black
17
10
1
6
10.5
61.8
100.0
1201.8
1301.8
Rapid
All
0
0
0
0
0.0
0.0
0.0
0.0
0.0
White
0
0
0
0
0.0
0.0
0.0
0.0
0.0
Black
0
0
0
0
0.0
0.0
0.0
0.0
0.0
Blitz
All
0
0
0
0
0.0
0.0
0.0
0.0
0.0
White
0
0
0
0
0.0
0.0
0.0
0.0
0.0
Black
0
0
0
0
0.0
0.0
0.0
0.0
0.0
Colour
Games
Wins
Draws
Losses
Score
%
Dp
Aor
Perform
Main
All
74
44
3
27
45.5
61.5
97.6
1213.3
1310.9
White
37
21
2
14
22.0
59.5
80.4
1208.5
1288.9
Black
37
23
1
13
23.5
63.5
114.9
1218.0
1332.9
Standard
All
69
40
3
26
41.5
60.1
86.2
1214.8
1301.0
White
35
20
2
13
21.0
60.0
85.0
1210.2
1295.2
Black
34
20
1
13
20.5
60.3
87.5
1219.6
1307.1
Rapid
All
5
4
0
1
4.0
80.0
255.0
1192.1
1447.1
White
2
1
0
1
1.0
50.0
0.0
1179.5
1179.5
Black
3
3
0
0
3.0
100.0
425.0
1200.6
1625.6
Blitz
All
0
0
0
0
0.0
0.0
0.0
0.0
0.0
White
0
0
0
0
0.0
0.0
0.0
0.0
0.0
Black
0
0
0
0
0.0
0.0
0.0
0.0
0.0
Top 20 opponents most often played
#
Chess SA id
Name
Games
Score
Wins
Draws
Losses
%
Aor
Dp
Perform
View
1
1170149169
Barkhuizen, R (Reuben)
4
3.0
3
0
1
75.0
1262.3
212.5
1474.8
View list
2
1160147672
Rocher, G (Gideon)
4
1.0
1
0
3
25.0
1222.4
-212.5
1009.9
View list
3
1170157329
Roberts, M (Marthinus)
3
2.0
2
0
1
66.7
1228.8
141.7
1370.5
View list
4
1160148677
Roos, B (Benjamin)
3
1.5
1
1
1
50.0
1274.6
0.0
1274.6
View list
5
1160157441
Swart, E (Eben)
3
1.0
1
0
2
33.3
1281.9
-141.7
1140.2
View list
6
2160161729
Nawrattel, A (Abigail)
2
2.0
2
0
0
100.0
1251.6
425.0
1676.6
View list
7
1170162033
Sahoo, S (Shaurya)
2
2.0
2
0
0
100.0
1251.6
425.0
1676.6
View list
8
2170157446
Snyman, M (Margaux)
2
2.0
2
0
0
100.0
1276.6
425.0
1701.6
View list
9
2160162781
Westermann, Z (Zelri)
2
2.0
2
0
0
100.0
1251.6
425.0
1676.6
View list
10
1160153451
Fredericks, M (Matai)
2
0.0
0
0
2
0.0
1226.9
-425.0
801.9
View list
11
1150147659
Du Toit, W (Wilco)
1
1.0
1
0
0
100.0
1353.2
425.0
1778.2
View list
12
2140304567
De Wet, N (Nina)
1
1.0
1
0
0
100.0
1334.2
425.0
1759.2
View list
13
2140304566
De Beer, M (Marielle)
1
1.0
1
0
0
100.0
1334.2
425.0
1759.2
View list
14
1150147657
Danzfuss, E (Edrich)
1
1.0
1
0
0
100.0
1359.2
425.0
1784.2
View list
15
2160150926
Fredericks, B (Bethany)
1
1.0
1
0
0
100.0
1334.2
425.0
1759.2
View list
16
1150147661
Fourie, M (Marchant)
1
1.0
1
0
0
100.0
1359.2
425.0
1784.2
View list
17
1130137398
Geyer, J (Ju-Han)
1
1.0
1
0
0
100.0
1309.9
425.0
1734.9
View list
18
2160143809
Gerber, Z (Zoe)
1
1.0
1
0
0
100.0
1334.2
425.0
1759.2
View list
19
1160158379
Gauche, K (Kian)
1
1.0
1
0
0
100.0
1200.0
425.0
1625.0
View list
20
1160152741
Botha, M (Marloux)
1
1.0
1
0
0
100.0
1234.8
425.0
1659.8
View list